feat: file dispatch system, file-type icons, multi-instance notepad

- Add extension-based dispatch to driver.storage.filedispatch with typed
  union (variant record THandlerKind = hkMagic/hkExtension)
- Extract file-type icon constants and mapping to core.gfx.fileicons
- Add core.search utility (getFileExtension, fmtFileSize, sortStringArray)
- Generate PUA bitmap icon fonts (32/64/128px) from Font Awesome via
  gen_file_icons.py + compile_icons.sh toolchain
- Integrate file dispatch into file browser (double-click triggers dispatch)
- Register notepad as handler for text file extensions
- Fix init order in app.mgr (filedispatch.init before app inits)
- Refactor notepad from singleton to multi-instance (up to 8 windows)
  using instance array, findStateByWid, and LVGL user_data on msgboxes

toolchain/compile.sh

@@ -26,6 +26,7 @@ declare -a run_steps=(
 	"compile_stub.sh" "Failed to compile stub!"
 	"compile_vergen.sh" "Versions failed to compile"
 	"compile_lvgl.sh" "Failed to compile LVGL!"
+	"compile_icons.sh" "Failed to generate icons!"
 	"compile_wasuro.sh" "Failed to pull Wasuro!"
 	"compile_sources.sh" "Failed to compile FPC Sources!"
 	"compile_link.sh" "Failed linking!"

toolchain/compile_icons.sh

@@ -0,0 +1,60 @@
+#!/usr/bin/env bash
+# compile_icons.sh — Generate file-type icon bitmap fonts from Font Awesome.
+# Runs gen_file_icons.py to produce asuro_icons_{32,64,128}.c in lvglh/,
+# then compiles each into a .o in lib/ for linking.
+set -e
+
+TOOLCHAIN_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+CONF_DIR="$(pwd)/lvglh"
+OUT_DIR="$(pwd)/lib"
+FONT_CACHE="$(pwd)/img"
+LVGL_DIR="/tmp/lvgl"
+CACHE_DIR="/code/lvgl"
+
+# Use cached LVGL source (or /tmp clone) for include paths
+if [ -d "${CACHE_DIR}/src" ]; then
+    LVGL_INC="${CACHE_DIR}"
+elif [ -d "${LVGL_DIR}/src" ]; then
+    LVGL_INC="${LVGL_DIR}"
+else
+    LVGL_INC="${CACHE_DIR}"
+fi
+
+CC="gcc"
+CFLAGS="-m32 -march=i686 -ffreestanding \
+    -fno-builtin -fno-stack-protector -fno-pic -fno-pie \
+    -O2 -Wall -Wno-unused-function -Wno-unused-variable \
+    -I${CONF_DIR} \
+    -I${LVGL_INC} \
+    -I${LVGL_INC}/.. \
+    -DLV_CONF_INCLUDE_SIMPLE"
+
+echo " "
+echo "======================="
+echo " "
+echo "Generating file-type icons..."
+echo " "
+
+# Run the Python generator
+python3 "${TOOLCHAIN_DIR}/gen_file_icons.py" "${CONF_DIR}" --font-dir "${FONT_CACHE}"
+
+# Compile generated C files into object files
+ERRORS=0
+for src in "${CONF_DIR}"/asuro_icons_*.c; do
+    [ -f "$src" ] || continue
+    base="$(basename "${src%.c}")"
+    echo "  Compiling ${base}.c ..."
+    if ! $CC $CFLAGS -c "$src" -o "${OUT_DIR}/${base}.o" 2>&1; then
+        echo "  FAILED: ${base}.c"
+        ERRORS=$((ERRORS + 1))
+    fi
+done
+
+if [ "$ERRORS" -ne 0 ]; then
+    echo "Icon compilation FAILED (${ERRORS} errors)."
+    exit 1
+fi
+
+echo " "
+echo "Icons generated and compiled."
+echo " "